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[XFRM]: User interface for handling XFRM_MSG_MIGRATE

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Add user interface for handling XFRM_MSG_MIGRATE. The message is issued
by user application. When kernel receives the message, procedure of
updating XFRM databases will take place.

Signed-off-by: Shinta Sugimoto <shinta.sugimoto@ericsson.com>
Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shinta Sugimoto 2007-02-08 13:12:32 -08:00 committed by David S. Miller
parent 80c9abaabf
commit 5c79de6e79
1 changed files with 173 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

173
net/xfrm/xfrm_user.c
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@ -1632,6 +1632,176 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
return 0;
}
#ifdef CONFIG_XFRM_MIGRATE
static int verify_user_migrate(struct rtattr **xfrma)
{
struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
struct xfrm_user_migrate *um;
if (!rt)
return -EINVAL;
if ((rt->rta_len - sizeof(*rt)) < sizeof(*um))
return -EINVAL;
return 0;
}
static int copy_from_user_migrate(struct xfrm_migrate *ma,
struct rtattr **xfrma, int *num)
{
struct rtattr *rt = xfrma[XFRMA_MIGRATE-1];
struct xfrm_user_migrate *um;
int i, num_migrate;
um = RTA_DATA(rt);
num_migrate = (rt->rta_len - sizeof(*rt)) / sizeof(*um);
if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
return -EINVAL;
for (i = 0; i < num_migrate; i++, um++, ma++) {
memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
ma->proto = um->proto;
ma->mode = um->mode;
ma->reqid = um->reqid;
ma->old_family = um->old_family;
ma->new_family = um->new_family;
}
*num = i;
return 0;
}
static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
struct rtattr **xfrma)
{
struct xfrm_userpolicy_id *pi = NLMSG_DATA(nlh);
struct xfrm_migrate m[XFRM_MAX_DEPTH];
u8 type;
int err;
int n = 0;
err = verify_user_migrate((struct rtattr **)xfrma);
if (err)
return err;
err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
if (err)
return err;
err = copy_from_user_migrate((struct xfrm_migrate *)m,
(struct rtattr **)xfrma, &n);
if (err)
return err;
if (!n)
return 0;
xfrm_migrate(&pi->sel, pi->dir, type, m, n);
return 0;
}
#else
static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
struct rtattr **xfrma)
{
return -ENOPROTOOPT;
}
#endif
#ifdef CONFIG_XFRM_MIGRATE
static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
{
struct xfrm_user_migrate um;
memset(&um, 0, sizeof(um));
um.proto = m->proto;
um.mode = m->mode;
um.reqid = m->reqid;
um.old_family = m->old_family;
memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
um.new_family = m->new_family;
memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
RTA_PUT(skb, XFRMA_MIGRATE, sizeof(um), &um);
return 0;
rtattr_failure:
return -1;
}
static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
int num_migrate, struct xfrm_selector *sel,
u8 dir, u8 type)
{
struct xfrm_migrate *mp;
struct xfrm_userpolicy_id *pol_id;
struct nlmsghdr *nlh;
unsigned char *b = skb->tail;
int i;
nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id));
pol_id = NLMSG_DATA(nlh);
nlh->nlmsg_flags = 0;
/* copy data from selector, dir, and type to the pol_id */
memset(pol_id, 0, sizeof(*pol_id));
memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
pol_id->dir = dir;
if (copy_to_user_policy_type(type, skb) < 0)
goto nlmsg_failure;
for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
if (copy_to_user_migrate(mp, skb) < 0)
goto nlmsg_failure;
}
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
skb_trim(skb, b - skb->data);
return -1;
}
static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
struct xfrm_migrate *m, int num_migrate)
{
struct sk_buff *skb;
size_t len;
len = RTA_SPACE(sizeof(struct xfrm_user_migrate) * num_migrate);
len += NLMSG_SPACE(sizeof(struct xfrm_userpolicy_id));
#ifdef CONFIG_XFRM_SUB_POLICY
len += RTA_SPACE(sizeof(struct xfrm_userpolicy_type));
#endif
skb = alloc_skb(len, GFP_ATOMIC);
if (skb == NULL)
return -ENOMEM;
/* build migrate */
if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
BUG();
NETLINK_CB(skb).dst_group = XFRMNLGRP_MIGRATE;
return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE,
GFP_ATOMIC);
}
#else
static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
struct xfrm_migrate *m, int num_migrate)
{
return -ENOPROTOOPT;
}
#endif
#define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
@ -1653,6 +1823,7 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
[XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
[XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
[XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
[XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
};
#undef XMSGSIZE
@ -1679,6 +1850,7 @@ static struct xfrm_link {
[XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
[XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
[XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
[XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
};
static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
@ -2285,6 +2457,7 @@ static struct xfrm_mgr netlink_mgr = {
.compile_policy = xfrm_compile_policy,
.notify_policy = xfrm_send_policy_notify,
.report = xfrm_send_report,
.migrate = xfrm_send_migrate,
};
static int __init xfrm_user_init(void)